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Old 02-15-2012, 03:05 PM   #101
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I don't think I fried the O2 sensors because it did richen up if I gave a lot throttle. It's probably not safe to idle that lean is it? Should I add more ASE percentage?
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Old 02-15-2012, 03:21 PM   #102
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So I switched it back to 6.2 req. fuel. starts up idles 1500 but gauge still reads lean. So I turn it off. Leave, few minutes later fire it up. Revs up to 3000 and dies. My O2 sensor must be fried..
Edit: Ok it's definitely not fried. When I start it, it shoots up to 3000 so when it starts to drop I'd give it a little gas and it'd shoot back up. I did this until my sensor warmed up. It read 16.1 at 3000
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Old 02-15-2012, 04:44 PM   #103
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or maybe you has bad parameters that cause this to happen...


sounds like your fuel map is lean but your warmup map is very aggressive.
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Old 02-15-2012, 04:53 PM   #104
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That's 100% very possible. I think my o2 sensor is done for though. It just sits at 18 on the gauge after it warms up. It'll move to like 16-17ish if I give it gas but it doesn't move on the analog gauge.
Edit: It's also quite sooty. Which I believe is an indication of running rich.
Editedit: ok so i tested the sensor and its not bad. How can it be that rich? I'm so dumb.

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Old 02-15-2012, 06:00 PM   #105
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Idk wtf is going on with my sensor. I sprayed it with carb clearer thinking if its broke what harm could it do, if its not the readings will change. They did change but after it dried it went back to just reading lean. With that said I did two more data logs and will upload my msq. The one data log has 6.2 as its required fuel, and no changes to the fuel table VE1. The other has req. fuel of 7.45 and no changes to fuel either. It starts and idles way better with the req. fuel at 7.45. At 6.2 req. fuel it starts sometimes, others I have to use the throttle a bit and doesn't for crap.
Attached Files
File Type: msl 2-15-12 rf6.2 nofuel.msl (150.7 KB, 40 views)
File Type: msl 2-15-12 rf7.45 nofuel.msl (225.1 KB, 40 views)
File Type: msq CurrentTune.msq (84.4 KB, 47 views)
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Old 02-15-2012, 07:16 PM   #106
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I hate this nonsense. So I tested my wideband using the aem way. It checked out. I plugged in the old ecu and surprisingly (even with the rx8 injectors) it fired right up. afr's were where they should be. So I plugged the ms back in. Turn it on. It immediately went super lean when the sensor heated up. I tried removing fuel, that didn't help, I tried messing with ASE and warm up enrichment. Nothing seems to help.
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Old 02-15-2012, 07:29 PM   #107
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Super lean = not enough fuel
Super rich = too much fuel

I wouldnt worry too much about the O2 sensor, they dont just stop working all that ofter when your just getting the motor running.

Seems like warmup enrichment is where you need to spend some time. I also wouldnt be using the gas peddle at all, yet. If it wont start and or idle by itself its the table(s) setup, throttle wont be a good thing if it does rev up and your table isnt there to keep it in control, so to speak.

Be sure to change one thing at a time and then test. That way if it doesnt change or makes it worse you can swap right back. It doesnt hurt to take written notes aswell.
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Old 02-15-2012, 07:42 PM   #108
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Quote:
Originally Posted by Miater View Post
Super lean = not enough fuel
Super rich = too much fuel

I wouldnt worry too much about the O2 sensor, they dont just stop working all that ofter when your just getting the motor running.

Seems like warmup enrichment is where you need to spend some time. I also wouldnt be using the gas peddle at all, yet. If it wont start and or idle by itself its the table(s) setup, throttle wont be a good thing if it does rev up and your table isnt there to keep it in control, so to speak.

Be sure to change one thing at a time and then test. That way if it doesnt change or makes it worse you can swap right back. It doesnt hurt to take written notes aswell.
I know I'm just not sure how to make fuel adjustments if the sensor was bad. I can get it to start and idle by itself but again. When the sensor warms up it goes 18:1
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Old 02-16-2012, 01:44 AM   #109
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Quote:
Originally Posted by gorillazfan1023 View Post
Todd how did you come up with 7.45? The calculator on tuner studio says it should be 6.2.
Go to this thread:
https://www.miataturbo.net/showthrea...&highlight=rx8
and read the whole thing.
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Old 02-16-2012, 09:08 AM   #110
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Quote:
Originally Posted by thirdgen View Post
Go to this thread:
https://www.miataturbo.net/showthrea...&highlight=rx8
and read the whole thing.
Ok I will. I was just wondering because it starts, runs, idles, everything better, with that req fuel. I do get a lot more belt squeal when it starts though.
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Old 02-16-2012, 02:23 PM   #111
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Ok so I messed with some settings today. The warm up enrichment is very aggressive (I think). It starts and idles. My O2 sensor is really pissing me off though. How could it possibly be so lean? Should I get a second sensor or something and test it with that? Anyway I let it idle for a few minutes then turned it off because I need to put in an oil restricter. I'm so confused I'm also extremely afraid to try and drive it because of the O2 sensor.
Attached Files
File Type: msq CurrentTune.msq (84.4 KB, 61 views)
File Type: msl 2-16-12rf7.45.msl (721.7 KB, 44 views)
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Old 02-17-2012, 07:54 PM   #112
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So I talked to my mechanic today. He said to check all my sideband wiring, and then if that checks out to put in the stock ecu, warm it up, then swap to megasquirt and see what it does. Guess I'm going to put my stock injectors in, finish my exhaust and just deal with it for now.
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Old 02-17-2012, 08:47 PM   #113
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Do you have a vaccum gauge? Make sure your not leaking anywhere. That would cause a lean condition.
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Old 02-17-2012, 09:51 PM   #114
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Quote:
Originally Posted by Miater View Post
Do you have a vaccum gauge? Make sure your not leaking anywhere. That would cause a lean condition.
My boost/vac gauge seems normal. I don't think it's actually lean. Because the sensor works fine with the stock ecu. My mechanic suggested that the wiring could be affecting the outputs, but we still couldn't figure out why the gauge would also read lean.
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Old 02-18-2012, 11:59 PM   #115
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I hate my car. I put the stock ecu back in, along with stock injectors, and power card. It still goes full lean. My mechanic told me the soot may have to burn off if the car was running rich previously. It did start to go down towards normal, but then would go back to full lean. I only let it idle for maybe 5 minutes. It acts really weird. Any load on the alternator makes the belt squeal and sometimes it would just drop the idle and the whole car shakes..So is there a way to tell if my engine if done for?
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Old 02-19-2012, 12:06 AM   #116
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I highly doubt your engine is done for...you run an LC1 right? The sensor might be effed from the rich running "soot"...maybe.
I'm sorry to hear you gave up on MS for now...I'll email you as promised tomorrow, I'm not on my email system.
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Old 02-19-2012, 09:22 AM   #117
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I just wanted to drive my car and work on megasquirt on weekends. However...I let the car idle then tried to test drive it...yeah not so good which is what gives me concern about the motor. It shakes, shutters, and tries to stall every time I let the clutch out and give it gas. I stalled 5 times backing out of my driveway and pulling back in. Hopefully it's not toast, but I'm making a built engine shopping list anyway.
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Old 02-19-2012, 10:39 AM   #118
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It sounds to me like you're not running on all 4 cylinders. Perhaps somehow you fried a COP?
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Old 02-19-2012, 10:44 AM   #119
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It sounds like its running on all cylinders. It wasn't shaking like it did when I developed a misfire. And timing has been reduced to full retard. We first tried disconnecting the lc-1 form the ms. It didn't go full lean right away but a few moments later it did. I swapped in the stock injectors and it still read full lean(I went back to the base tune and changed required fuel to 13.2) Then we put the stock ecu back in and it still went full lean, but i'm also an idiot and I forgot to tighten two intake manifold bolts when I swapped injectors so that was letting air in and yeah running poorly.
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Old 02-19-2012, 10:52 AM   #120
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Check for spark on all four plugs. Especially if it starts smelling fuel a few minutes after the motor starts shaking.
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